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Investments - Schedule of Credit Quality of Investment Securities With Contractual Maturities or The Issuer of Such Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 1,276,732 | $ 1,064,330
% of Total Fair Value | 100.00% | 100.00%
AAA |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 385,954 | $ 333,516
% of Total Fair Value | 30.20% | 31.30%
AA |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 143,512 | $ 128,249
% of Total Fair Value | 11.20% | 12.00%
A |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 430,319 | $ 356,090
% of Total Fair Value | 33.70% | 33.50%
BBB |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 311,096 | $ 245,823
% of Total Fair Value | 24.40% | 23.10%
No Rating Available |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 5,851 | $ 652
% of Total Fair Value | 0.50% | 0.10%

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